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Question

Installer PostgreSQL.

Solution

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apt-get update
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apt install postgresql
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Reading package lists... Done
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Building dependency tree
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Reading state information... Done
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Suggested packages:
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  postgresql-doc
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  The following NEW packages will be installed:
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    postgresql
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    0 upgraded, 1 newly installed, 0 to remove and 93 not upgraded.
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    Need to get 5,392 B of archives.
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    After this operation, 59.4 kB of additional disk space will be used.
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    Get:1 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 postgresql
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    all 9.5+173ubuntu0.3 [5,392 B]
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    Fetched 5,392 B in 0s (120 kB/s)
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    debconf: delaying package configuration, since apt-utils is not installed
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    Selecting previously unselected package postgresql.
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    (Reading database ... 30282 files and directories currently installed.)
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    Preparing to unpack .../postgresql_9.5+173ubuntu0.3_all.deb ...
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    Unpacking postgresql (9.5+173ubuntu0.3) ...
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    Setting up postgresql (9.5+173ubuntu0.3) ...
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Question
Comment obtenir des informations sur le statut du service PostgreSQL ?
Solution
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systemctl status postgresql
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● postgresql.service - PostgreSQL RDBMS
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   Loaded: loaded (/lib/systemd/system/postgresql.service; enabled; vendor preset: enabled)
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   Active: active (exited) since Wed 2020-05-06 12:11:15 UTC; 2s ago
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  Process: 6194 ExecStart=/bin/true (code=exited, status=0/SUCCESS)
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 Main PID: 6194 (code=exited, status=0/SUCCESS)
Le service est bien chargé dans le système (Loaded: loaded) et il est bien actif (Active: active).